Introduction
In this lab we were challenged to apply our camera knowledge that we learned from our first lab in a few different real world settings. We were using manual settings on a DJI Mavic Pro 2 to ensure that we had total control over the Images and we got the best results.
Methods
First Object
The first object that we had to take an image of was a large object in the hanger. We took an image of a white airplane on a white background, which provided a challenge as the exposure was hard to dial in and ensure that the airplanes details would not mix with the floor. We also had a dark colored engine on the airplane that provided a challenge because we wanted to also be able to see the dark details in the engine. We changed the aperture to f 3.3 and a shutter speed of 1/30 and an iso of 100. We used the histogram to help us get these settings because originally the peaks were all off to the left on auto settings, meaning the picture was under exposed so we corrected it by increasing the length of shutter and increasing the aperture.
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| Figure 1, Airplanes In the hanger |
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| Figure 2, Screen Capture of Object 1 |
Second Object
For our second object we were challenged to take photos of the bikes on the racks outside Niswonger, we had a challenge with this photo because the dark sky had made the photo different from the one inside, but we had also had more light hitting the sensor with some of the sunlight bouncing off of the clouds. We increased the aperture to F3.5 to decrease the light hitting the lens, and we also increased the shutter speed to 1/3200 to decrease the exposure of the photo. We may have gone overboard with the shutter speed change as the histogram shows that the photo is skewed to the left meaning that it is under exposed.
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| Figure 3, Photo of the bike rack, object 2 |
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| Figure 4, Screenshot of the photo of object 2 |
Object 3
For object 3 we took photos of the closet in the 209 lab, we focused on getting the details visible in the dark closet.We opened the aperture all the way up to f2.8 to let as much light hit the sensor as possible, we then increased the shutter speed to try to brighten up the photo, but we got to an issue when the shutter speed got into the seconds range. The photos would be blurry as my hand holding the drone would have moved slightly during the second or 2 and caused a blurred image. So we settled on a faster shutter speed and bumped up the iso to 800 to correct for the exposure in this photo.
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| Figure 5, Photo of cables and ipad in the closet, object 3 |
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| Figure 6, Screen shot of photo of object 3 |
Object 4
For object 4 we could decide what we wanted to take a photo of, so we took a photo of a turbine engine display, this was a challenge as the details inside the engine were dark, and the area surrounding the engine was bright. We had to change the settings for a bit to capture the image that we wanted. We closed the aperture to f3.5 to decrease the light hitting the sensor, and we hanged the shutter speed to 1/5 as we wanted the darker parts of the image to have more time to hit the sensor. We set the iso to 100 because we wanted to make sure that there was no extra noise in the photo.
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| Figure 7, Photo of a turbine engine, object 4 |
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| Figure 8, Screenshot of photo of object 4 |
Discussions
During the class we discussed with Dr.Hupy about the two theories for setting camera settings, Shutter Priority and Aperture Priority. Both have their use cases, shutter priority is very useful for mapping missions, sports photography, essentially anything where the camera or the subject is moving. Shutter priory helps in these cases because motion blur would ruin these images and data could not be collected from them in the case of mapping missions. Aperture priority is better for taking close up images, as the subject is really sharp and the background is blurred. Aperture priority could be good for inspections as you want the details that you are inspecting to be very sharp and crisp to make sure you can see all the details of the inspection. Aperture and shutter priority each have their advantages and disadvantages so it is important to know when to use each of them and how to apply them to the mission at hand.
Conclusions
In conclusion, I learned when to use shutter and aperture priority and how to properly expose photos in real world situations to ensure that I collect the best data from a task. It is important to fully understand the cameras manual settings as it allows for more control over the images captured and it helps ensure that the images collected allow for minimal post processing.
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